Valve drive having a rocker arm

US6851403B2 · kind B2 · utility

Assignee

• Andreas Stihl AG & Co. KG · DE

Inventors

• Bernhard Durr · Stuttgart, DE
• Bruhns Imke · Fellbach, DE
• Jurgen Haberlein · Murrhardt, DE
• Harald Schliemann · Waiblingen, DE
• Jorg Schlossarczyk · Winnenden, DE
• Manfred Rabis · Schorndorf, DE

Key dates

• Filing date: Aug 31, 2001
• Grant date: Feb 8, 2005
• Expiry date: Sep 10, 2021

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02B2275/34
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A valve drive having a rocker arm mounted on a cylinder head is provided. One end of the rocker arm is actuated by a push rod to actuate a valve stem of a poppet valve that engages the other end of the rocker arm, which is pivotably held between its ends on a support pin that extends into the cylinder head, with a spherical mounting being provided between the support pin and the rocker arm. Provided on that side of the rocker arm remote from the cylinder head is a bolt head for adjusting the bearing spacing between the rocker arm and the cylinder head for adjusting valve play. To prevent unintended adjustment of the bolt head, the latter cooperates with a rotation preventing element that has an arresting portion that engages the bolt head, and a support portion that conveys the adjustment moment away.